As with Facebook, essentially anyone or any organization can create a Twitter feed, but in some sense Twitter lacks the reciprocal nature of a true social network — plenty of feeds have thousands of followers but follow far fewer people in return themselves (do you think that Ashton Kutcher really pays attention to what you say?). (epolitics.com)
Longer stay and paid hosting (for example exchange visits and work experience) is defined as either where: pupils are hosted by the same family for the whole or greater part of a visit and commonly there is an expectation that there will be a reciprocal nature to the visits; or there is a payment made to the host family for the stay. (educationbusinessuk.net)
Examples include: to focus a team when establishing its behavioural norms; in circumstances where trust has been eroded; when wanting all parties to understand the reciprocal nature of trust; to focus on a single fundamental principle for school or team effectiveness; to gain or give feedback; as the basis on which an intervention might be planned. (teachermagazine.com.au)