Should i use symfony or not -

i want make lite facebook version using symfony 1.4. had issues symfony , memory in past :

is wise go symfony ? server requirements run smoothly (cpu, memory ...) ?

thanks

about memory more or less question how define "lite" ;) there ton of successful websites using symfony 1.4 (also big ones example delicious.com), believe question of scalability more how mature knowledge performance issues.

what alternative approaches have in mind? writing own framework? strong advice use existing 1 instead (does not have sf1.4 though), work start implementing actual application logic done you.

did habe @ symfony2? more modern framework quite stable (as 2.1 new forms component released soon) suggest using ;)