Consider Twittler, it is a social network platform where user sends tweets of 280 characters • Each tweet may have a number of hashtags. (a hashtag is a string starting with #) We record the time and location of each tweet. A tweet may include up to four media items (either a photo or a video) •A tweet may refer to a user • Tweet can be a quote another tweet • User can follow user or hashtags • To use Twitter, a user must register by his(her) email, phone number, and user name. Design an entity-relationship diagram

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Requirement Analysis

A process that determines the user expectations for a software product is called requirement analysis. In software engineering, requirement analysis is known as requirement engineering. It involves communication with end-users and stakeholders to determine whether the system or software requirements are validated, conflicts are solved, and key requirements are documented. The first activity of the Software Development Life Cycle (SDLC) is requirement analysis.