One of the consequences of sharing personal information with others is (surprise) they will learn about us and understand us better (if we are honest about the information we share). Opening up and sharing personally information is of course, a pathway to more meaningful interpersonal relationships - just ask any relationship counselor! Being understood is very reinforcing as it makes us feel connected with others on a deeper level. To call being understood "addicting" is perhaps unfair. However, being understood on Facebook is likely not as meaningful or as rewarding as being understood when it primarily develops from in-person contact. Also, depending on what information you share and who you share it with, being understood isn't always desirable! Still, a desire to have others understand us (regardless of how it happens) may contribute to Facebook Addiction.