Ý Nghĩa Và Cách Sử Dụng Của Hashtag ( Dấu # ) Trên Facebook

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Ý nghĩa và cách sử dụng của hashtag ( dấu # ) trên Facebook

Khi lướt trên mạng xã hội Facebook hoặc một số mạng khác thì mình thấy trong các status hay các comment thường có những đoạn như: #Đông #Tây #Nam... Ta dễ dàng bắt gặp hashtag trên Twitter, Pinterest và Instagram, trong Blogger thì hashtag có vai trò to lớn. Và hầu hết người viết đều không biết ý nghĩa của dấu # đó. Hôm nay chúng ta cùng tìm hiểu về nó.

Ví dụ

Bài viết by Quốc Khánh Bùi.

Ý nghĩa của dấu thăng

Hầu hết mọi người thường nghĩ rằng dùng dấu# kết hợp với tên một người là một cách tag tên, tuy nhiên không phải như vậy, vì khi tên của bạn được một người nhắc đến trong bình luận hay bạn được người khác tag tên vào một status nào đó thì bạn sẽ nhận được một thông báo. Như vậy có nghĩa là dấu # không dùng để tag tên. Vậy nó dùng để làm gì? Facebook cung cấp cho chúng ta một tính năng đó là hashtag, nó có tác dụng để phân loại status cho dễ tìm kiếm có nghĩa là những status có cùng hashtag sẽ ở cùng một trang. Chính vì vậy chúng ta có thể liên kết với nhau mà không cần phải tham gia nhóm hay trang nào. Dấu # mà ta thấy đó chính là hashtag

Cách dùng

Hashtag thường gồm một dấu # ở đầu và liền sau nó là một xâu kí tự liên tiếp không có khoảng trắng. Để sử dụng thì rất đơn giản, bạn chỉ cần thêm ký tự # trước từ hoặc cụm từ viết liền (không có dấu cách) mà mình sẽ đặt làm từ khóa trong ô đăng cập nhật của bạn. Ngay sau khi bạn nhấn dấu #, ô màu xanh sẽ xuất hiện trên từ hoặc cụm từ bạn chọn làm hashtag. Sau khi đăng tin trên Facebook, phần hashtag sẽ được bôi đậm màu xanh. Mỗi hashtag thường là một từ đơn như #blog #blogspot chẳng hạn, tuy nhiên để khỏi trùng với người khác thì bạn làm một cái dài hơn như #Chungtoiyeublogging. Sau khi đăng status bạn có thể click vào hashtag để xem những bài có cùng hashtag với bạn. Ngoài ra bạn cũng có thể tìm kiếm được hashtag mà mình quan tâm bằng cách nhập hashtag vào ô tìm kiếm Lưu ý: Chế độ bảo vệ riêng tư cũng áp dụng cho các status chứa hashtag. Nghĩa là không phải ai cũng có thể xem status nếu bạn không đặt chế độ công khai. Quoc Khanh Bui Hi! My name is Quoc Khanh. I am from Vietnam.

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Lúc trước mình thử tìm cách để tự nhắn tin cho mình xem sao. Với hành động này mình có thể dùng nó để lưu lại một file, hình ảnh, hay một đoạn văn bản nào đó mà không để cho người khác biết, cái này cũng tương tự như một số bạn dùng Gmail rồi tạo một tin nháp, sau đó họ lưu lại thông tin trong tin nháp đó. Vì là tin nháp nên sẽ không ai thấy được, còn với Facebook thì khác, nó không có tính năng tạo tin nháp nên mình có ý tự gửi tin nhắn cho mình để chỉ mình đọc được. Cách để tự gửi tin nhắn cho mình cũng có một số vướng mắc nhỏ nên mình viết bài này để hướng dẫn cho các bạn cùng biết. Image

Floating point number (IEEE 754)

Đã bao giờ bạn dùng javascript và tự hỏi tại sao 0.1 + 0.2 lại bằng 0.30000000000000004 chưa? Đó là bởi vì trong máy tính, số thập phân sẽ được biểu diễn một cách gần đúng với giá trị mà bạn mong muốn, và chúng ta sẽ tìm hiểu về nó trong bài này. Nội dung bài viết: - Biểu diễn một số thập phân dưới dạng floating point trong máy tính. - Chuyển floating point ngược lại số thập phân. - Cộng hai số được biểu diễn dưới dạng floating point. - Tại sao chúng ta lại biểu diễn số thập phân dưới dạng floating point, mà không phải là một dạng khác? 0. Floating point 32 format. (image from Wikipedia) Trước khi vào bài viết, bạn cần biết rằng hiện tại có hai loại floating point được dùng phổ biến. Loại thứ nhất gọi là Single-precision floating point, sử dụng 32 bit để biểu diễn số thập phân. Loại thứ hai là Double-precision floating point, sử dụng 64 bit để biểu diễn số thập phân, do dùng nhiều bit hơn nên nó có thể biểu diễn số thập phân lớn hơn, với độ chính xác cao hơn. Trong bài nà...

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