一群羊关在羊圈里，在羊圈的出口横放一根木棍，羊要出圈吃食，就必须从木棍上跳过去，第一只羊跳了过去了，第二只、第三只也会跟着跳过去；这时，有人把那根棍子撤走，后面的羊，走到这里，仍然像前面的羊一样，向上跳一下，尽管拦路的棍子已经不在了。
这就是羊群效应。
所谓的“羊群效应”也就是“从众心理”。是管理学上分析市场行为的一种常见现象。它是指由于对信息不充分的和缺乏了解，投资者很难对市场未来的不确定性做 出合理的预判，往往是通过观察周围人群的行为而提取信息，在这种信息的不断传递中，许多人的信息将大致相同且彼此强化，从而产生从众行为。“羊群效应”是由个人理性行为导致的集体的非理性行为的一种非线性机制。
1.Block settings:
Region: defined in theme, where the block shows.
Mulilingual settings: which language to show.
Block title: <none> for no title.
Role specific visibility settings: Show block for specific roles.
Page specific visibility settings: Show block on specific pages.
2.Flag module*: trigger actions or trigger rules(rules module).
Display flagged content using views.
3.Menu: Separate by language or user role.
Menu add in the region of block to display.
4.Triggers and actions:Ttrigger module, can fire these actions when certain system events happen.
Extent trigger api and action api to do this.
5.Validation API: validate form inputs.
6.Custom error: Define 403,404 errors.
7.Date and time: UTC time or so.
8.Email change confirmation settings
9.Error reporting: Write errors to the log
10.File system, File system path: (public method or private method)
11.File upload paths: Dir pattern
12.Fivestar: rating system
13.Google Analytics: User tracking system.
14.Image toolkit: JPEG quality
15.Input formats: Html,php,txt by role
16.Jammer: remove preview button
17.Jquerymenu
18.Languages: path prefix,icons,language switcher block,Default language,Language domain
19.Translate interface: Import export po file. extract modules po dir, translate some strings.
20.Database logging
21.Performance: cache, page compression, block cache, css js compress
22.Persistent Login, expiration time, login redirection
23.Points for action
24.SMTP Authentication Support: smtp settings.
25.Site information: site name, email, default url
26.Login Destination
27.Permissions
28.Roles
29.Sections: different theme for role
30.Dynamic display block
31.Backup and Migrate
32.Views API: different style of table
33.Advanced Book Blocks
34.Apache Solr framework, Apache Solr search
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python webkit2png http://blog.eood.cn
