The best way to avoid it is simply to always put things in your own words, as a summary, compendium, expansion, criticism, or set of questions. Everybody reads and picks-up things here and there from their readings, but they do not go blunting it out verbatim. Specific parts that are well phrased and meaningful to replicate can, and probably should, be included in quotes, but the poster should build and elaborate somewhat around that.

As to including the reference, which is the plagiarism accusation killer (mind you, not the unsubstantial post killer), needless to say, one should add the correct references, and not any reference pointing to who knows what.

Lately I’ve see a post whose references were all wrong, and when trying to ament the situation (after been called out), the added references were even worse. The have to be specific to where the core of the text comes from, not generic. Besideds the serve as a source for the readers to expand, and not get lost in.

Another case on my local board must have read that references were needed. He goes and includes them, but pointing to whatever crap he wants to shill, being non-related to the topic being treated.

Even if it seems needless to say, for the sake of those who do not infer the obvious, references have to be accurate (people do actually go and check them out).