In this activity, you will research various social networking sites and online and offline communities. Then write a concept document for a viable social network. It could be a personal network, a general-interest network, or a professional network. Your concept

document should answer the following questions:

• What concept is your site based on?

• What useful features will you incorporate in your site?

• Who are the target users that you have in mind?

• What type of content will you present on your site?

Finally, cite the sources that you used for your research

Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.

Given int variables k and total that have already been declared, use a while loop to compute the sum of the squares of the first 50 counting numbers, and store this value in total. thus your code should put 11 + 22 + 33 + + 4949 + 50*50 into total. use no variables other than k and total.

If i wanted to include a built-in calendar in a document, what option could i select? draw table insert table insert chart quick tables