However, a lack of social contact while lurking sometimes causes loneliness or apathy among lurkers. One reason lurkers lurk is the need to learn more about the group. Lurkers lurk rather than participate for a variety of reasons. Interviews can also be used to answer the question of why and how lurkers lurk. Lurkers experience less belonging in a community compared to regular contributors. Lurkers are participants who join a virtual community but do not contribute. The targets of the crackdown even included those Twitter lurkers with very few followers. Lurkers can also negatively influence other community members. Both lurkers and posters frequently enter communities to find answers and to gather general information. As the number of members in a group rises, the percentage of lurkers also rises. They also found that lurkers felt more energetic than posters. In many communities lurkers are still seen as free-riders. Questionnaires in contrast are better for asking the why and how of lurkers. Lurkers are reported to constitute over 90 percent of several online groups. Today lurkers are viewed both positively and negatively.