What do comments with [...] mean?

I get a bunch of comments that simply repeat the title with '[...]'. ie:

[...] Some cool post title [...]

Is this spam or is wordpress doing something wrong? I have the akismet plugin enabled.

Topic akismet comments spam posts Wordpress

Category Web

1
answered at

Its most likely to be a TrackBack or pingback:

In a nutshell, TrackBack was designed to provide a method of notification between websites: it is a method of person A saying to person B, "This is something you may be interested in." To do that, person A sends a TrackBack ping to person B.

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