Palestine Today reports that Gazans have been receiving mysterious phone calls, whose origin appears to be from centers of international studies or from Arab groups abroad.
According to the article, the callers pretend to be asking questions for surveys, but they are really an attempt by Israeli security to gather intelligence.
The questions have included asking whether the people being polled witnessed rocket attacks, or how they would react if fighters asked to use their house.
Even though this seems a little heavy-handed, it is plausible. Corporate espionage often uses such techniques to elicit information from competitors, and even if most of the people refuse to answer such questions, you only need a few to get valuable information.