The opposite of synchronous is asynchronous, something that is not happening in real time, rather senders ship off their messages for recipients to open at their convenience. Asynchronous communication examples include: email, texting, newsgroups, listservs, blogs, MySpace, Facebook, YouTube. Examples of one-to-one asynchronous communication include: email and
text messaging. Examples of one-to-many asynchronous communication
include: newsgroups, listservs, blogs, MySpace, Facebook, and YouTube.