I am building a social networking site using elgg. I wanted to host it on amazon cloud. basically to measure scalability. I wanted to know if its possible for me to host my elgg app on amazon cloud.
Yep ;-) It's been done. There may be some learning with respect to Amazon EC2 mechanics and config - they should have their own tutorials for this anyway. IZAP - I believe have done a fair amount of work with EC2 -- if you get their attention and/or spare time.. or else just go thru the EC2 Dev tutorials ;)