Every additional form of communication you take part in is a burden to some degree, and depending on the person they may only have the capacity for a handful before it becomes overwhelming. Personally I can handle like 4 forms of primary communication before either further forms become mostly ignored or it starts hurting my ability to communicate with anyone on anything. I can understand that someone, no matter how much they may want to stay in touch, may just be unable to through some forms of communication.
Yep, I use SMS and email, and don't see a need for anything else. Neither of these impose any particular demand on anyone who wants to contact me; they don't need to install any apps or set up any new accounts.
