Evite

Evite is a social-planning website for creating, sending, and managing online invitations.
Evite was launched in 1998. The website is a free, advertisement-supported service. Evite was co-founded by Al Lieb and Selina Tobaccowala. It was acquired in 2001 by conglomerate IAC/InterActiveCorp. In 2010, Liberty Media acquired ownership of Evite from IAC.
Usage.
An event organizer creates an online invitation through the website via a simple interface. This online invitation is colloquially referred to as "an Evite". The host enters e-mail addresses of prospective guests and Evite sends e-mails to the guests. Each guest is in one of four categories: "Attending", "Not Attending", "Maybe", and "Not yet replied". Guests move themselves from the "Not yet replied" category to one of the three "replied" categories and can write additional comments.
Features.
Style.
The HTML page for the invitation may have various stylistic features chosen by the inviter. These include setting, color, layout, and renaming the four guest categories.
Updates.
Hosts may opt to send guests updates when other guests RSVP for the event, or when the event details are changed.
Legal controversy.
According to Mashable and Venturebeat, Evite has threatened to sue San Francisco-based startup and competitor Socializr (acquired by Punchbowl.com in November 2010) due to alleged copyright infringement.
Data breach.
In July 2019, Evite data was spotted for sale online. Evite admitted that their systems were compromised and data of over 100 million accounts were stolen. According to Evite, the breach did not contain "user information more recent than 2013". The stolen data included users' real names, usernames, email addresses, passwords, dates of birth, phone numbers, and mailing addresses. Evite recommended users to change their passwords on Evite (but did not require them to do so). Also, since Evite stored plaintext passwords (not password hashes), if passwords were reused elsewhere, those accounts could be vulnerable to credential stuffing attacks.