Guardando il sorgente della pagina del profilo di facebook mi sono accorto che vengono richiamati ben 60 script javascript.

Qualcuno mi può spiegare come mai ce ne sono così tanti e a che cosa servono?

La differenza tra il 2-5-8 per esempio in che cosa consiste?
Gli ho "unpackati" qui per capirci qualcosa:
http://www.strictly-software.com/unpack-javascript
Eccoli:

codice:
http://static.ak.fbcdn.net/rsrc.php/...L58NUI3tspU.js
http://static.ak.fbcdn.net/rsrc.php/...l8aPMBawucy.js
http://static.ak.fbcdn.net/rsrc.php/...qc3PFuyOtyr.js
http://static.ak.fbcdn.net/rsrc.php/...l8aPMBawucy.js
http://static.ak.fbcdn.net/rsrc.php/...qc3PFuyOtyr.js
http://static.ak.fbcdn.net/rsrc.php/...Fc3M_hyWwhV.js
http://static.ak.fbcdn.net/rsrc.php/...5Aw4sTn6ZS_.js
http://static.ak.fbcdn.net/rsrc.php/...yYDWpTsp0JC.js
http://static.ak.fbcdn.net/rsrc.php/...23ez8IFGSPo.js
http://static.ak.fbcdn.net/rsrc.php/...2Mh25GaL3gk.js
http://static.ak.fbcdn.net/rsrc.php/...jMCMA0x_ObI.js
http://static.ak.fbcdn.net/rsrc.php/...mvmvxDKTeL4.js
http://static.ak.fbcdn.net/rsrc.php/...XQ1IPAI9NyR.js
http://static.ak.fbcdn.net/rsrc.php/...65c9OW-i481.js
http://static.ak.fbcdn.net/rsrc.php/...sifCEKQXtVG.js
http://static.ak.fbcdn.net/rsrc.php/...hwOyT9fmfZV.js
http://static.ak.fbcdn.net/rsrc.php/...H-tHgFo_KTQ.js
http://static.ak.fbcdn.net/rsrc.php/...61VSNDvRJnS.js
http://static.ak.fbcdn.net/rsrc.php/...EMWHH85KfdZ.js
http://static.ak.fbcdn.net/rsrc.php/...R5wmaM_QbL2.js
http://static.ak.fbcdn.net/rsrc.php/...VGfQ5QQmksr.js
http://static.ak.fbcdn.net/rsrc.php/...hCn6u3fXLtg.js
http://static.ak.fbcdn.net/rsrc.php/...RRaobSXAaXM.js
http://static.ak.fbcdn.net/rsrc.php/...ZeZFU7zHXuC.js
http://static.ak.fbcdn.net/rsrc.php/...ppwOo4BAmlb.js
http://static.ak.fbcdn.net/rsrc.php/...fvXyHGM5qlP.js
http://static.ak.fbcdn.net/rsrc.php/...ghlEJgSKAee.js
http://static.ak.fbcdn.net/rsrc.php/...Bi5k-UD0xh1.js
http://static.ak.fbcdn.net/rsrc.php/...NOxgpIxVpzl.js
http://static.ak.fbcdn.net/rsrc.php/...1JLOXCxT49R.js
http://static.ak.fbcdn.net/rsrc.php/...POHS5VbMRTj.js
http://static.ak.fbcdn.net/rsrc.php/...EKA5EzGo0o5.js
http://static.ak.fbcdn.net/rsrc.php/...mETqyI1opEC.js
http://static.ak.fbcdn.net/rsrc.php/...tlO9tP9El3X.js
http://static.ak.fbcdn.net/rsrc.php/...OoEdEM63foT.js
http://static.ak.fbcdn.net/rsrc.php/...y1sd3C7N-hO.js
http://static.ak.fbcdn.net/rsrc.php/...81hiqJhZIkC.js
http://static.ak.fbcdn.net/rsrc.php/...TLQCiBp06Od.js
http://static.ak.fbcdn.net/rsrc.php/...32TT8pUcnOK.js
http://static.ak.fbcdn.net/rsrc.php/...RWcbcAN1CEj.js
http://static.ak.fbcdn.net/rsrc.php/...z4ylP0OuE2s.js
http://static.ak.fbcdn.net/rsrc.php/...EgloSZA3NO_.js
http://static.ak.fbcdn.net/rsrc.php/...JWx4BeIK-D3.js
http://static.ak.fbcdn.net/rsrc.php/...cKvpeirhrl3.js
http://static.ak.fbcdn.net/rsrc.php/...82xYTaKax4I.js
http://static.ak.fbcdn.net/rsrc.php/...QwvlOnFPoWJ.js
http://static.ak.fbcdn.net/rsrc.php/...vdRbxBYF555.js
http://static.ak.fbcdn.net/rsrc.php/...Kyamz8DlYXZ.js
http://static.ak.fbcdn.net/rsrc.php/...2PkTFjdVPzc.js
http://static.ak.fbcdn.net/rsrc.php/...BOoPM_bpFre.js
http://static.ak.fbcdn.net/rsrc.php/...NwLLsOqr8oL.js
http://static.ak.fbcdn.net/rsrc.php/...hVJgtZGqxJX.js
http://static.ak.fbcdn.net/rsrc.php/...4U2nDwUGA7l.js
http://static.ak.fbcdn.net/rsrc.php/...OlOwgdGoIU7.js
http://static.ak.fbcdn.net/rsrc.php/...Yv6SBFEngDU.js
http://static.ak.fbcdn.net/rsrc.php/...5lpXIw2-Ra7.js
http://static.ak.fbcdn.net/rsrc.php/...GPrBtdk0jHE.js
http://static.ak.fbcdn.net/rsrc.php/...CZoaG-Dv3-X.js
http://static.ak.fbcdn.net/rsrc.php/...MYKGXHtIC9J.js
http://static.ak.fbcdn.net/rsrc.php/...NxHRrY2g65C.js