There are obviously a ton of web applications where you can “bookmark” your favorite sites. In the past I’ve had students in our after-school ESL computer lab bookmark their favorite links out of the 7,000 on my website and then they could share them with other students. It was an opportunity for them to help build face-to-face relationships and to speak English explaining why they liked the ones they chose.
I like Only2Clicks for this purpose because with this site your page of bookmarks shows not only the names of the sites and their link, but screenshots. This kind of visual support can be helpful to English Language Learners, and to many others.