Fcbk s scl md nd scl ntwrkng srvc wnd by th mrcn tchnlgy cnglmrt Mt. Crtd n 2004 by Mrk Zckrbrg wth fr thr Hrvrd Cllg stdnts nd rmmts, drd Svrn, ndrw McCllm, Dstn Mskvtz, nd Chrs Hghs, ts nm drvs frm th fc bk drctrs ftn gvn t mrcn nvrsty stdnts. Mmbrshp ws ntlly lmtd t Hrvrd stdnts, grdlly xpndng t thr Nrth mrcn nvrsts. Snc 2006, Fcbk llws vryn t rgstr frm 13 yrs ld, xcpt n th cs f hndfl f ntns, whr th g rqrmnt s 14 yrs. s f Dcmbr 2023, Fcbk clmd lmst 3.07 blln mnthly ctv srs wrldwd. s f Nvmbr 2024, Fcbk rnkd s th thrd-mst-vstd wbst n th wrld, wth 23% f ts trffc cmng frm th ntd Stts. t ws th mst dwnldd mbl pp f th 2010s.
Fcbk cn b ccssd frm dvcs wth ntrnt cnnctvty, sch s prsnl cmptrs, tblts nd smrtphns. ftr rgstrng, srs cn crt prfl rvlng prsnl nfrmtn bt thmslvs. Thy cn pst txt, phts nd mltmd whch r shrd wth ny thr srs wh hv grd t b thr frnd r, wth dffrnt prvcy sttngs, pblcly. srs cn ls cmmnct drctly wth ch thr wth Mssngr, dt mssgs (wthn 15 mnts ftr sndng), jn cmmn-ntrst grps, nd rcv ntfctns n th ctvts f thr Fcbk frnds nd th pgs thy fllw.
Th sbjct f nmrs cntrvrss nd lwsts, Fcbk hs ftn bn crtczd vr sss sch s sr prvcy (s wth th Cmbrdg nlytc dt scndl), pltcl mnpltn (s wth th 2016 .S. lctns) nd mss srvllnc. Th cmpny hs ls bn sbjct t crtcsm vr ts psychlgcl ffcts sch s ddctn nd lw slf-stm, nd vr cntnt sch s fk nws, cnsprcy thrs, cpyrght nfrngmnt, nd ht spch. Cmmnttrs hv ccsd Fcbk f wllngly fclttng th sprd f sch cntnt, s wll s xggrtng ts nmbr f srs t ppl t dvrtsrs.