Seems an interesting question to ask. We have seen the falls of major governments within the past four or so years, is this a rare thing to have so many o overthrow s of the government in such a short time? Its interesting that some nations that are not arab have caught the spring fever.
I presume by "what we are seeing" you're referring to groups of revolutions that seem to be triggered by common causes? The answer is yes. Revolutionary historians often speak of revolutionary "waves", of revolutions that share broad goals, tactics, and sometimes even personel.
The first "wave" of Revolutions comes from the French revolution and mostly dominated Europe, although it inspired revolutionaries as far way as Latin America. The next "wave" was one of liberal nationalist democrats and began in 1848, covering most of Europe. After that a "wave" broke out that began during World War I with the Russian revolution and echoed throughout Europe, with one historian concluding that it didn't finish until the end of the second world war. The final "wave" followed the collapse of the USSR and broke out throughout Eastern Europe, but also touched Africa and East Asia.
Some scholars have argued that other groups of revolutions, such as those in Africa in the post-colonial era, also constitute a "wave". In the 00s people talked about a "wave" of "colour revolutions" mostly in post-Soviet states, although others saw them as continuations and consolidations of the 1989 "wave". Whether the Arab Spring uprisings constitute a separate "wave" remains too soon to tell.
Source: Mark Katz, 'Revolutionary Waves'