A way to organize online objects (documents, resources…) by users, who add tags or keywords from a controlled language to describe their content and represent their subject. 

An user-defined collection of controlled terms (metadata).

Lack of ambiguity, lack of user interaction and lack of correctness.

Lack of context, lack of synonymy and lack of equivalence between terms.

y = 24.4 − 0.69x

y = 24.4 + 0.69x

y = 28.7 − x

y = −0.69 + 24.4x

Users can tag and untag data whenever they want with speed and ease, meaning that folksonomies remain current and reflect current viewpoints

A browsing strategy is extremely fruitful using social tags and folksonomies to find web resources that are of interest to them and people who have common interests

An information seeker will tend to optimize search methods in the least effort mode available

The user's command of different languages and computer languages should be taken into account when searching for information.

The information seeking behaviour will not stop until all relevant results desired by the user are found, approximately at the exact point of recall and precision.