Actually many of these images are being planted by venezuelan intelligence services to discredit the protests. We have no need to post fake protest images, we have plenty of violent images, no need to make them up:
Actually the government has done this kind of practice before. They wait until an opposition's leader retweet those images and then they claim that is the opposition who is faking the news and that nothing is happening. After a while the opposition had learn to identify those things but unfortunately people still is retweeting those.
Yes, as your link very well shows, there are many occurrences of tweets with pictures from other places being used as if they were from Venezuelan protests. Unfortunately these often get retweeted unknowingly.
Here are some videos that can be verified from Venezuela:
OP provides an interesting fact. There is no need to extrapolate more meaning than what's given: that there is media manipulation going on. To answer to your points more data points would be needed.
There are many interesting facts. i.e: you may look outside of your apartment window, and see thousands of folks protesting, closing roads, fighting the police, etc. Then turn on the TV for more info, and voila! no news, everything is fine according to local TV.
The fact is either irrelevant to discussion (in which case it is off-topic) or it isn't (in this case we have to extrapolate more meaning to link those two).
Or the listener can decide how relevant it is, because this thread is about Venezuela, the protests, and the internet, and the fact is about Venezuela, the protests, and the internet.
Every fact shared isn't required to be an explicit part of a marketing campaign, is it?
edit: it's depressing that this whine is floating above video of police actually kicking unarmed people in the head and (possibly) shooting at cameramen.
There is no such thing as "leaders of opposition" right now (oppositors turned their back on formed leader capriles for being too mild and indulgent); just people that posts images and videos on twitter. I haven't seen those egypt and bulgaria pics and I have seen the events with my own eyes.
So.. <rolleyes> at international leftist propaganda.
https://www.youtube.com/watch?v=OqmzfwqczZw https://www.youtube.com/watch?v=vxbdzBYjAug https://www.youtube.com/watch?v=iw9sAxy-fQY