We waste our tym by siting and chatting with frndz for long tym
there is a pssibility of being cheated by stranger
tym consuming
Its no wrong to say this millennium as the era of internet. connecting people might be nokia's dream but mark zuckerberg was serious. just imagine if every single human being in this world had a facebook account then we could know about each and every human being in this world 
 another reason is that facebook is an autobiography and posting on wall is like  is like writing a paragraph on the autobiography notebook.facebook keeps a privacy of the evils that you did exepyt from your buddies.facebook has now become a business platform  infact to become famous.