Compress and reduce easysocial images size

Hello, i am sharing this post here because i think many of you may have the same problem,

my com_easysocial folder is about 1GB of size, there is many images and that take 90% of the total size, i'd tryed one time to compress some ones and seems to be reducing size,
now we are looking for a software to compress all images after downloading them.

i found this list :
http://www.creativebloq.com/design/image-compression-tools-1132865