Yes you can. But you need a ftb3 entitlement code either buy the Game UMD or buy the entitlement off the PSN store for $20.

By the way heres the hardware:

FTB3 1.10 762MB CSO: http://www.megaupload.com/?d=8ECQJW7T

PSNAbler Files: http://www.sendspace.com/file/2mrukr

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Steps to playing online with UMD:
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Step 1, Copy one of the tactics.prx's from either North America or
Europe folders into the SocomLoader folder

Step 2, Copy the SocomLoader folder into /psp/game/

Step 3, Copy the psnabler UCUS-98716.bin file from the "UMD" directory into
your /seplugins/psnabler/ folder on your memory stick.

Step 4, Launch the umd by using the "socomloader" homebrew from your games
category. (used for umd mode only).

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Steps to playing with a CSO / ISO:
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Use the CSO provided

, Copy the psnabler patch from the CSO ISO FOLDER into /seplugins/psnabler/

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Tips for using psnabler:
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There are different versions of the ftb3 patch, the reason is because the memory
shifts when you are using the loader so a 2ndary "UMD" patch had to be made, it is
alot easier to use the umd launcher program.