Post making contest 5.0

Let's see, as of Unicode 9.0 (according to Wikipedia), there are 128019 graphic characters, 153 format characters (like spaces), and 65 control codes. Not all of these control codes, however, can be used in a post (sorry, bell). Thankfully, tab, linefeed, and carriage return are, so that means there are a grand total of 128175 characters that can make up a post.
Now, the limit on the number of characters in a post is 65535, so that means there are 128175⁶⁵⁵³⁵ total full-length posts, or about 7.78×10³³⁴⁷³⁹ posts. HOWEVER a post doesn't have to be full length, so we also need to consider all posts of length 0, 1, 2... 65534 as well. Thankfully, the sum from i=0 to n of xⁱ is just (xⁱ⁺¹-1)/(x-1). So, plugging that all in gives us... a near negligible number of additional posts. So the grand total, to as much precision as Wolfram Alpha will allow me is...

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Spoiler7.780010208681719765348852921114468637464253965871869004052236752989903032734261787249381368632342296025392685926540661646616269886653931361659918530516967521144525478216481235794580517616015331170614480185235641777418508648518979587299976596137855987272271673104471075455009073502990756102649388548095757947414551058814537418661181030428742963365922268880138055903763811948610931055427700903172916426886147301706468958432097269725665903061557526685137291823658387673030999063054156956398703429994764568728454542710368691756418198200268806427429261816740502891636024681556561969113555494184287307997232232879706078198504388925949995085144697205739498165741339633031136900300085888526289552977061243615625357634678100172092667065046541746015700257942741686823919850605759542761935146800010388674242820695508282257874278264063392357004452464395019754265256960256163153796633637296827982936801435311155038366495487335966712840152031505311581221399181250746019306074592308847543113324622934652995004365885878065726094152387179771559391549137564309465566032414153441420323311723297578522716852507507625821822068626801920161475441345129040783948979074018660995160009051180253317730926663745897625464770362335915256549671177997748856079932637995417977436500635059730657970680261055845080752857485374327733678377722530473927117567649609498331385912809553739872131223387631619551509563923586926541620437468488142775806791977254427683804531949625021374820859188041388870528982514160732654372868555019576944637270011337203144925763232458857510775054130859082187672084759085286510177676964329875917284895252450773540572542188924806846011004587263265479317146160290948298269666259645894278747880059938879049861668071275256972793300115254332317003598407203204088551450694899612338756593774188751867461052929119185380348927012078123154063240788086442187520118377203076978760385348344097705219769418090193844211329203866035141138583114705576775757969142534193837411248243349984668871229386604577722585007827596530332134228267572323197251187265546956138407323498335055637818021198147891414399414226063136396854342304055879142676276700412378589001979372294449802049132363146519676011285565739347377103772383169216828947187339916785216945656389814523941902432182389422944147319863631843095802872638108587366412569075887599506734886334454378832680569121860404879571065588644128732353258923775459136171594481642271553270003677535294415545922338901351762789649503595255318684255393940589847314216683014691017914455036511818964630454374302904760632197882148826591287407032758035496000842615147327982459510016803032372409257228165996091320902132601267333174614963589950938413637492928697857385042270932105226906779921643394314454896531809543448725468307838559310725374675772982967867565434624630327617797724051365948810048900919534936630901775344108413566628333428090653169191202221371541384859184218198294940211147768112676813217085907528117369151246276533790188656714849701917004374632365440659859364644469257231257643544406795615935091656210088273141951484437301692174018731669560850409018412066341546198885500094865084966127360866070964095522183557668559356715564784198512149659229563699795047432617613660491195200861260303540245074186653853255852739631783008065083863536097648662791480923544611610740236661643345570471037869771120553076213339739312980752051391139083069596085857451550908427943870780378420620958221968515585057429773892419843208458270913301586549872140403735889780352378225552055113929440872006660377721220000946181070550786843449063430671591530588976116295075858915560846491944734089441928110870492369076545619711095657966227954072076225433539...×10³³⁴⁷³⁹

I think that's just slightly more posts than we have made.