This is also because the business model of apple vs FB|GOOG is completely opposite. People pay apple for their products. People expect everything from Google and FB to be free.
People are paying apple for their products and do not want to pay to have that product riddled with spam.
Frankly, FB has to figure out how to make a search service, via fb.com and their mobile apps.
An interesting twist could be to allow users to search for things that other users are doing or planning to do. e.g. "who is interested in going to the movies tonight?" and let a group organize around that activity - then sell them discounted movie tickets.
People are paying apple for their products and do not want to pay to have that product riddled with spam.
Frankly, FB has to figure out how to make a search service, via fb.com and their mobile apps.
An interesting twist could be to allow users to search for things that other users are doing or planning to do. e.g. "who is interested in going to the movies tonight?" and let a group organize around that activity - then sell them discounted movie tickets.