two of the hottest startups in the social space right now are
facebook and twitter.and they are also the most sort after dev
platforms right now for apps and services everyone wants their product
or service to get a presence on this social networks

for young people in dev in goa this two might be a gd way to learn and
see how high end api's are developed so that third party applications
can be built on top of them

facebook is written in php
where as twitter is written in ruby on rails there was a talk sometime
back that ruby on rails apps cant be scaled properly and that is the
reason why twitter used to always be down and cause frustration to the
people using it

twitter can be found at twitter.com
and facebook at facebook.com

the respective developer help for this two platforms can be found at
this urls
http://developers.facebook.com
http://apiwiki.twitter.com/

first sign up if you are not on this platforms then you can come up
with some app ideas to enrich the user experience on this sites
they both support development in any language of your choice it can be
java , c# , php etc etc

have fun hacking at this two platforms :)

if anyone does come up with anything it would be nice if that info was
shared over here


Regards
Fritz