Media richness theory implies that a sender should select a medium of appropriate richness to communicate the desired message or fulfill a specific task. Senders that use less-rich communication media must consider the limitations of that medium in the dimensions of feedback, multiple cues, message tailoring, and emotions. Take for example the relative difficulty of determining whether a modern text message is serious or sarcastic in tone. The leanness of the text prevents the transmission of tone and facial expression which would otherwise be useful in detecting the sarcasm. However, results from a study conducted by Anandarajan et al. on Generation Y's use of instant messaging conclude that "the more users recognize IM as a rich communication medium, the more likely they believe this medium is useful for socialization." Though Generation Y users consider texting to be a rich medium, there is additional evidence that shows that easily accessible and non-intrusive media (i.e., texting, Twitter) were more likely to be used for sharing positive than negative events, and intrusive and rich media (i.e., phone calling) were more likely to be used for sharing negative than positive events. Additionally, in order to better understand teenagers' use of MSN (later called Microsoft Messenger service), Sheer examined the effect of both media richness and communication control. Among other findings, Sheer's study demonstrated that "rich features, such as webcam and MSN Spaces seemingly facilitated the increase of acquaintances, new friends, opposite-sex friends, and, thus, the total number of friends."