_dsl.rb

#Databind model
   u=User.new;u.id=1
    u.add_friend(10.days.ago,2)
    u.add_friend(7.days.ago,3)
    u.add_follower(6.days.ago, 4)
    u.add_friend(6.days.ago, 23)
    u.add_friend(6.days.ago, 33);
    u.remove_friend(5.days.ago, 2)
.................

#query model
#get current friends and followers on twitter
friends = u.friends
followers = u.followers

#get friends at time in past
friends=u.friends(at: 30.days.ago)

#find out when someone followed you
followers.sample.timestamp

#find your 'bros' (people who you follow and follow you back)
u.bros

#see all your new followers this month
a = u.followers(at: Time.now.beginning_of_month)
b = u.followers(at: Time.now)
new = b-a


ap u => (SEE BELOW FOR OUTPUT)

data_struct.rb

This is the output of my structure from the ap gem. How should I persist this? redis, postgres, etc??? 
It's basically two hashes one for followers and friends. The keys are dates and each key has an array events.

#<User:0x7fe08dd169b8
    attr_accessor :followers = #<Timeline:0x7fe08dd16940
        attr_reader :hash = {
            "2012.07.23" => [
                [0] {
                       :event => :follow,
                    :follower => 4,
                    :followee => 1
                }
            ]
        },
        attr_reader :length = 1
    >,
    attr_accessor :friends = #<Timeline:0x7fe08dd16990
        attr_reader :hash = {
            "2012.07.19" => [
                [0] {
                       :event => :follow,
                    :follower => 1,
                    :followee => 2
                }
            ],
            "2012.07.22" => [
                [0] {
                       :event => :follow,
                    :follower => 1,
                    :followee => 3
                }
            ],
            "2012.07.23" => [
                [0] {
                       :event => :follow,
                    :follower => 1,
                    :followee => 23
                },
                [1] {
                       :event => :follow,
                    :follower => 1,
                    :followee => 33
                }
            ],
            "2012.07.24" => [
                [0] {
                       :event => :unfollow,
                    :follower => 1,
                    :followee => 2
                }
            ]
        },
        attr_reader :length = 5
    >,
    attr_accessor :id = 1
>