So you could:
a) join in one of the above at the appropriate time: simply search for the hashtag #twitterangelus on Twitter;
b)start one in your own timezone;
c) continue praying the angelus privately, with your family as you already do;
d)start (or resume) praying the angelus privately, with your family (as you used to or not, as the case may be);
e) none of the above.
NB: e) is a poor option!
For those who wish to join or start a local #twitterangelus, all the texts are here in Latin and here in English. Copy and paste works well - but do remember to pray the prayers as well as copy and paste them!
Why #twitterangelus? In honour of our Lady, of course, and her Blessed Son; but also because we have discovered that there is a sense of real, if virtual, connection established by praying together remotely like this (especially if one is on one's own); and also to bear public witness amidst the noise of Twitter to the eternal realities (especially once we get it trending!)