Likert scale: Widely used in opinion research where people express their agreement or disagreement with a proposition, often on a five point scale (from strongly disagree, through no opinion, to strongly agree).
Link building: The process of getting more inbound links to your website for improved search rankings.
Lobbying: Part of public affairs, lobbying involves attempts to influence public policy through relations with legislators and others involved in government. Variously viewed as a natural part of a functioning democracy and an attempt to exert undemocratic influence, lobbyists are now subject to registration and increased scrutiny.
Longitudinal research: This measures trends over time as distinct from opinion surveys which present a snapshot.